Question

a)Predict the osmotic pressure order for the following(assume salts are 100% dissociated).I0.1 M ureaII0.1 M NaClIII0.1M Na2SO4IV0.1 M Na3PO4
(b)If equal volumes of all these solutions are mixed then calculate the osmotic pressure of the net resultant solution obtained at 300K

Answer 1

A) $\pi$ = i crt

1) $\pi$ = 1 × 0.1 RT = 0.1 RT

2) $\pi$ = 2 × 0.2 RT = 0.2 RT

3) $\pi$ = 3 × 0.3 RT = 0.3 RT

4) $\pi$ = 4 × 0.4 RT = 0.4 RT

 

B) Equal volume of two isotonic solutions are mixed

$\pi$resulant = $\pi$₁v₁+$\pi$₁v₁/ v₁+v₂ =$\pi$

note: $\pi$₁ = $\pi$₂ and v₁ = v₂ = v are given